JPS60167277A - Lead-acid battery - Google Patents

Abstract

PURPOSE:To increase productivity and volume efficiency by using a metal can such as aluminium can or zinc can as a container of a cylindrical sealed type lead-acid battery instead of a synthetic resin container and sealing the battery by crimping. CONSTITUTION:A cylindrical negative current collector 4 with bottom is made by lead or lead alloy, and a cylindrical metal can which also serves as a negative terminal is formed by zinc, aluminium, or nickel, and arranged in the outside of the current collector and electrically connected to the current collector 4. A spirally wound plate group is accommodated into the cylindrical negative current collector 4 and the negative current collector and the metal can are crimped to seal a battery. The contact between the negative current collector 4 and negative plate is made in the side wall and the bottom of the cylindrical current collector 4 by electrical welding. By this construction, lugs and a post of negative plate are eliminated. Therefore, productivity and volume efficiency are increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a small cylindrical sealed lead acid battery among lead acid batteries.

Conventional structure and problems Lead-acid batteries use sulfuric acid as the electrolyte, so strong and inexpensive metals like nickel-cadmium batteries cannot be used as the material for the battery case. has ABS
Resin materials such as polypropylene and polypropylene have been commonly used. Furthermore, even in conventional cylindrical lead-acid batteries whose outside is coated with a metal material, the resin material is used on the surface that contacts the internal electrolyte. When a synthetic resin material is used as a battery case material, the thickness of the battery case becomes larger in order to provide mechanical strength, compared to a battery using metal materials such as a nickel-cadmium battery, which reduces volumetric efficiency. It also has the drawbacks of being low cost, and the production process involves bonding and heat welding processes for sealing the battery, making it difficult to maintain an advantage in terms of productivity.

OBJECTS OF THE INVENTION The present invention is intended to improve the above-mentioned conventional drawbacks, and to avoid using synthetic resin as the case material of a cylindrical sealed lead-acid battery using the spiral electrode plate group as in the conventional case, The purpose is to improve productivity and volumetric efficiency by using an inexpensive metal can such as aluminum or zinc and employing a caulking sealing method.

Components of the Invention The lead-acid battery of the present invention includes zinc, aluminum, nickel, etc., which is electrically connected to a bottomed cylindrical negative electrode current collector made of lead or a lead-based alloy, and serves as a bottomed cylindrical negative electrode terminal on the outside. A can consisting of a can is provided, a group of medium-inclined spiral electrode plates is housed therein, and the can is sealed by caulking. Here, the connection between the negative electrode current collector and the negative electrode plate can be provided on the inner wall and bottom of the cylinder by electric welding by passing current between the negative electrode current collector and the grid of the negative electrode plate, so that the negative electrode plate is essentially Therefore, it is possible to eliminate the need for the electrode plate ears and the pole pillars.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an example of the configuration of a cylindrical sealed lead-acid battery according to the present invention.

゛ 1 is a positive electrode plate, 2 is a negative electrode plate, and both use an expanded grid. A positive electrode plate 1 and a negative electrode plate 2 constitute a spiral-shaped electrode plate group with a glass mat separator 3 in between, with the negative electrode being the outermost layer. Reference numeral 4 denotes a bottomed cylindrical negative electrode current collector made of a lead-based alloy, in which a group of electrode plates is housed. A negative electrode plate 2 is provided on the inner wall and bottom of the current collector 4.
A large current is passed across the body between the lattice body of the negative electrode plate 2 and the current collector 4 to form a connecting portion 5.
．． There are 6. Note that the negative electrode plate is substantially not provided with a pole column or an edge portion of the electrode plate. On the other hand, in the positive electrode 1, the ears 7 of the electrode plate are taken out from several places and connected to the pole pillar 8 of the positive electrode by welding. Reference numeral 9 denotes a zinc can, which is provided outside the negative electrode current collector 4 and electrically connected through an opening 10 of the can, with the bottom serving as a negative electrode terminal. 11 is a cylindrical sealing body made of acid-resistant rubber that is sealed after the electrolyte is injected, and has a hole in the center through which the positive electrode pole 8 passes, and a safety valve that adjusts the internal pressure. It also functions as a. 12 is a paper cloak that absorbs leaked electrolyte and prevents it from leaking to the outside; 13 is a disc-shaped sealing plate made of synthetic resin, which is integrally molded with the positive terminal 14; Reference numeral 15 denotes a positive electrode lead wire, which connects between the welded part 16 at the tip of the positive pole pole 8 and the positive electrode terminal 14. 17 is a hard wax layer provided between the negative electrode current collector 4 and the zinc can 9 which becomes the negative electrode terminal, and prevents electrolyte from leaking from the negative electrode current collector 4 due to pitting or the like and reaching the zinc can 9. It was established for the purpose of 18.1
9 is a caulking part for sealing. First, caulk along the circumference at part 18, and then press from the top at part 19. Reference numeral 20 denotes a heat-shrinkable tube that serves as a negative electrode terminal and insulates the side wall of a zinc can.

Next, the discharge capacity in the above configuration is 2.5Ah (1o hour rate)
The results of the charge/discharge cycle test for the battery will be explained below. Figure 2 shows charging at 2.5V/cell (maximum current 800mA) for 8 hours and constant current discharging at 250mA (maximum current 1,75V).
In Figure 2, A is a battery having the structure of the present invention, B is the same as the present invention, but the connection between the negative electrode plate 2 and the negative electrode current collector 4 is shown. In this case, only connection was made by contact, and welding by energization as in the present invention was not performed. C is a cylindrical lead-acid battery of conventional construction, using synthetic resin for the container material.9 The diameter of the battery is approximately 3 cm larger in order to have the same discharge capacity as A. Then, the ears of the electrode plates of both the positive and negative electrodes were taken out as current collector terminals and welded to the pole poles, and both terminals were placed toward the opening of the battery case.As can be seen from Fig. 2, the present invention It is shown that the charging and discharging characteristics of the battery are the same as those of the conventional battery C. Furthermore, it can be seen that when the negative electrode current collector and the negative electrode plate are only in contact as shown in B, the capacity decreases rapidly.

Effects of the Invention As described above, according to the present invention, compared to conventional cylindrical lead-acid batteries, the manufacturing process is simplified, volumetric efficiency is improved, and charge-discharge characteristics are comparable to those of conventional batteries. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal cross-sectional view of a lead-acid battery according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing the results of a charge-discharge cycle test of batteries of the embodiment and a comparative example. 1--Positive electrode, 2--Negative electrode, 3--Censorator, 4--Negative electrode current collector, 5, 6--Welded part, 8--
Positive electrode pole, 9. Metal can, 11-... sealing body, 13-.
... Sealing plate, 14... Positive terminal. Figure 1 Figure 2 Q? 0 41) 6080 /θθ Number of charge/discharge cycles

Claims (1)

[Claims] In a battery case, it consists of a bottomed cylindrical negative electrode current collector made of lead or a lead-based alloy, and a metal can that is electrically connected to this current collector and serves as a bottomed cylindrical negative electrode terminal provided outside of the current collector. A lead-acid battery that houses a group of electrode plates with a spiral structure, welds the inner surface of the negative electrode current collector and the grid of the negative electrode plates, and seals the opening of the battery case with a sealing member provided with a positive electrode terminal.